by john everett
(westminster MD)

Pressure needed for a die grinder rated at 4cfm @ 90 psi? I bought a craftsman pro compressor rated at 5.8 cfm @ 90 psi My die grinder requires 4cfm @ 90 psi  and I keep running out of air .

Craftsman Pro 27 gallon air compressor

Craftsman Pro 27 gallon air compressor

Should the compressor not be able to keep up with the use?

Compressor has a 27 gal tank

Any help would be greatly appreciated

John, when was the last time you got the mileage that the car EPA estimates said you would?

It’s the same with air compressors, as far as I’m concerned.

If you are running an extension cord to the compressor, don’t. That will be bleeding off motor power.

The compressor is dual voltage. If you can, and you are not, try running it with 240 volts instead of 120 volts.

Dial down the pressure to the die grinder if you can. That will help extend the air supply.

The specifications for this compressor, right from the Sears page are:

Drive Type: Belt Drive
Voltage: 120/240 volts
Horsepower: 1.9 hp
SCFM Delivery:
SCFM Delivery At 40 psi: 7.2 SCFM
SCFM Delivery At 90 psi: 5.8 SCFM
Compressor Tank Capacity: 27 gal.
Compressor Tank Pump Style: Oil Lube
Maximum Compressor psi: 150 psi
Compressor Tank Type: Vertical
Lubrication Type: Oil lubricated
Tank Style: Vertical
Type: Portable
Product Type: Air Compressors & Inflators

Despite those specs, sorry John… even though it says it is, I don’t believe the compressor is big enough to run your die grinder satisfactorily.

Other peoples thoughts?